Enterprise JavaBeans (EJB) is a server-side component architecture that simplifies the process of building enterprise-class distributed component applications in Java:

• Scalable, reliable, and secure applications.
• Not writing your own complex distributed component framework.
• RAD for the server side.
• Designed to support application portability and re-usability across vendor's enterprise middle-ware services.

EJB is a standard for building server-side components in Java. It defines an agreement (contract) between components and application servers that enables any component to run in any application server. EJB components (called enterprise beans) are deployable, and can be imported and loaded into an application server, which hosts those components.

Read more...